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Intensity mapping of post-reionization 21-cm signal and its cross-correlations as a probe of f(R) gravity

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Abstract

We propose the intensity mapping of the redshifted Hi 21-cm signal from the post-reionization epoch as a cosmological probe of f(R) gravity. We consider the Hu–Sawicki family of f(R) gravity models characterized by a single parameter \(f_{,R0}\). The f(R) modification to gravity affects the post-reionization 21-cm power spectrum through the change in the growth rate of density fluctuations. We find that a radio interferometric observation with a SKA1-mid-like radio telescope in both auto-correlation and cross-correlation with galaxy weak-lensing and Lyman-\(\alpha \) forest may distinguish f(R) models from \(\Lambda \)CDM cosmology at a precision, which is competitive with other probes of f(R) gravity.

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  1. https://www.skatelescope.org.

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Correspondence to Anjan Kumar Sarkar.

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This article is part of the Special Issue on “Indian Participation in the SKA”.

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Dash, C.B.V., Sarkar, T.G. & Sarkar, A.K. Intensity mapping of post-reionization 21-cm signal and its cross-correlations as a probe of f(R) gravity. J Astrophys Astron 44, 5 (2023). https://doi.org/10.1007/s12036-022-09885-w

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  • DOI: https://doi.org/10.1007/s12036-022-09885-w

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